slowly close the burn
be careful, its on fire
By not burning any thing
cos it does not burn itself nor supports burning
incinerators
incinerators
No: it requires an object for the verb "open". It would be correct to say something like "We must not open burning packages." Yes, if it means "We must not open (our shop, for example) while it is on fire.
put a plaster over the open cut
closed system
by burning fossil fuels
wet-scrubber units
Lower the energy consumption and/or switch to non-fossil energy.
In an open System, matter can enter from or escape to the surroundings (Like a burning match)
When the fire is burning, until the ashes are cold. The damper should be open at these times.